Five San Francisco police officers and a former officer have been indicted by a federal grand jury on charges including extortion, dealing drugs, stealing computers and other property from suspects and searching residential hotels without legal justification, the San Francisco Chronicle reports.

The wide-ranging federal probe stemmed from allegations first made in 2011 by city Public Defender Jeff Adachi, who released a series of surveillance videos showing what he called a pattern of misconduct by officers.

According to indictments unsealed Thursday, Officers Arshad Razzak, 41, Richard Yick, 36, and Raul Eric Elias, 44, all formerly assigned to the Southern police station at the city's Hall of Justice, are accused of conspiring to threaten and intimidate residents of single-room occupancy hotel rooms by entering them without legal justification by using a master key.